Starting device for a toy motor using an ultrasonic wave signal

Abstract

Disclosed is a starting device for a toy motor using an ultrasonic wave signal. The starting device comprises a transmitter external to the toy which generates an ultrasonic wave signal and a receiving and starting element disposed within the toy for receiving the transmitted ultrasonic wave signal and starting the toy motor. In a preferred embodiment, the motor drives a sound reproducing device. The ultrasonic wave signal from the transmitter is received, amplified, and detected, and when the detected output reaches a predetermined level, a switching transistor forming an energization path to the motor is turned on to start the motor. Once the motor is started, a self-holding switch associated with the switching transistor causes the switching transistor to supply continuous current to the motor even when the transmission of the ultrasonic wave signal has been terminated.

I claim: 
     
       1. A starting device for a toy motor using an ultrasonic wave signal comprising: a transmitter for generating an ultrasonic wave signal; and   a receiving and starting circuit for receiving the ultrasonic wave signal from said transmitter and for starting said toy motor, said receiving and starting circuit including:   a receiving transducer for receiving said ultrasonic wave signal;   an amplifier section connected to said receiving transducer for amplifying the received signal including R-C amplifier circuits;   a detection section connected to the output of said amplifier section for generating a detected output signal including diode rectifiers and charging-discharging capacitor; and   a motor starting section connected to said detection section for energizing said motor in response to an output signal from said detection section.   
     
     
       2. A starting device according to claim 1, wherein said motor starting section further comprises: a switching element for supplying a driving current to said toy motor in response to a detected output signal from said detection section; and   a self-holding switch associated with said switching element for supplying a continuous supply of driving current to said toy motor for a predetermined period of time.